探索保护结构工程进步的现代实验.pdf

1、Real-time Early Warning of Fire-Induced Collapse of Steel Trusses for Large-Span Buildings Guo-Qiang Li1,2,Shaojun Zhu2,Jinyu Li2,Wei Ji2,Yao Wang2 and Honghui Qi2 1.State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University2.College of Civil Engineering,Tongji University,Shan

2、ghai,ChinaPROTECT 2024,Singapore,13th 16thAug.,202401Background02Early-warning approach03Early-warning theory05Experimental validation06ConclusionsTable of contentsPage 204Early-warning techniques01Background02Early-warning approach03Early-warning theory05Experimental validation06ConclusionsTable of

3、 contentsPage 304Early-warning techniques01BackgroundPublic buildingsIndustrial buildings Advantages:Good load-bearing capacity,Large internal space Disadvantages:Low in redundancy,Poor in fire-resistanceDemandsTypeIndustrialPublicResidentialHospital&SchoolOfficeProportion(%)55.622.211.17.43.7Buildi

4、ng collapse accidents under fire in ChinaStatistic data of 2019Page 4Steel truss structures are widely used01BackgroundMaterial property degradation of steel at elevated temperatures200040060080010000102030405060t/minT/!CRapid temperature development of building firesPage 5Demands1.00.80.60.40.20.00

5、2004006008001000T/!CStrength reduction factorSmoke temperature of fire01BackgroundPage 6Large-span steel structures can easily collapse in fireDemandsBrusselsHong KongTehranChonburi01BackgroundPage 7DemandsBuildingLocationTimeTypeSituationCasualtiesPlasco BuildingTehran2017SteelTotal collapse30 fire

6、fightersBowling alleyTaoyuan2015SteelRoof collapse6 firefightersFactory buildingShanghai2014SteelTotal collapse2 firefightersFactory buildingWenzhou2013SteelTotal collapse5 firefightersSofa super storeCalifornia2007SteelTotal collapse9 firefightersLives of firefighters being at risk under unexpected